Abstract
Flow characteristics of compressible flow through eccentric and segmental orifices are investigated experimentally in subsonic and supercritical flow regimes bacause of the shortage of reliable experimental data in such high-speed flow. The results show that the ASME regulated figures for expansion factor can be applied up to the critical flow regime without remarkable error. Practical and convenient experimental formulae for expansion factors are proposed in this paper. Experiments to determine discharge coefficients and expansion factor for pipe taps are also carried out in order to provide a method of flow measurement with pipe taps. In addition, it is found that the pressure loss coefficient of a concentric orifice can be applied correspondingly to cases of both eccentric and segmental orifices.
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